3sticks unsalted butter, (1 1/2 cups), at room temperature
1½cupslight brown sugar
4large eggs
2 2/3cupsall-purpose flour
1teaspoonbaking powder
1teaspoonbaking soda
¼teaspoonsalt
1cupmilk
2teaspoonsvanilla extract
1cupsemisweet chocolate chips
For the filling and frosting:
1cup(2 sticks) unsalted butter, softened to room temp
1 1/2cupslight brown sugar
2teaspoonsvanilla extract
2 1/2cupsflour
1teaspoonsalt
1/2cupmilk
1 1/2cupsmini chocolate chips, (you may want more to put on top)
Instructions
Preheat the oven to 350° degrees. Line cupcake pan with 24 liners.
For the cupcakes: In the bowl of a stand mixer fitted with the paddle attachment, combine the butter and brown sugar. Beat together on medium-high speed until light and fluffy, about 3 minutes. Mix in the eggs one at a time, beating well after each addition and scraping down the sides of the bowl as needed.
Combine the flour, baking powder, baking soda, and salt in a medium bowl. Stir together to blend. Add the dry ingredients to the mixer bowl on low speed, alternating with the milk, beginning and ending with the dry ingredients, mixing each addition just until incorporated. Blend in the vanilla. Fold in the chocolate chips with a spatula.
Divide the batter evenly between the prepared cupcake liners. Bake for 18-20 minutes, until a toothpick inserted in the center comes out clean. Allow to cool in the pan 5-10 minutes, then transfer to a wire rack to cool completely.
For the filling and frosting: With a mixer, cream together the butter and sugar at medium speed. Add the vanilla and beat well. Add the flour and salt and mix until combined. Add just a little milk until it's cookie dough consistency. Once it is, gently fold in chocolate chips. Then take half of the mixture out and chill it in the fridge. This will be the filling. For the frosting you'll want a little thinner consistency. Add more milk to the remaining mixture gradually until desired consistency is reached. This is your frosting.
To fill the cupcakes, cut a cone-shaped portion out of the center of each cupcake. I found this a little tricky to get the hole out but then you get to eat what you take out! Fill each hole with a chunk of the chilled cookie dough mixture.
Frost cooled cupcakes. Store in refrigerator.
My husband thinks they are best served chilled. I think they are way better at room temperature where the frosting just melts in your mouth.
Notes
Source: Cupcakes from Annie's Eats ; Filling and frosting from [Sally's Baking Addiction | http://sallysbakingaddiction.com/2012/05/29/fudge-brownie-cupcakes-with-cookie-dough-frosting/